1 . 如图,在四棱锥VABCD中,底面ABCD是矩形,VD⊥平面ABCD,过AD的平面分别与VB,VC交于点M,N.
![](https://img.xkw.com/dksih/QBM/2020/1/16/2378538701512704/2379227111145472/STEM/54eaef40427540cfaf44319cd10cd759.png?resizew=136)
(1) 求证:BC⊥平面VCD;
(2) 求证:AD∥MN.
![](https://img.xkw.com/dksih/QBM/2020/1/16/2378538701512704/2379227111145472/STEM/54eaef40427540cfaf44319cd10cd759.png?resizew=136)
(1) 求证:BC⊥平面VCD;
(2) 求证:AD∥MN.
您最近一年使用:0次
2020-01-17更新
|
810次组卷
|
8卷引用:海南省东方市琼西中学2022届高三9月第一次月考数学试题
海南省东方市琼西中学2022届高三9月第一次月考数学试题【市级联考】江苏省镇江市2019届高三上学期期末考试数学试题(已下线)专题07 空间几何体的平行于垂直-《巅峰冲刺2020年高考之二轮专项提升》(江苏)江苏省盐城市伍佑中学2019-2020学年高三上学期第一次阶段考试数学试题四川省成都市青白江区南开为明学校2019-2020学年高二下学期第三次月考数学(文)试卷(已下线)考点22 点线面的判断与证明-2021年高考数学三年真题与两年模拟考点分类解读(新高考地区专用)湖南省常德市临澧县第一中学2020-2021学年高一下学期期末数学试题山东省菏泽市巨野实验中学2021-2022学年高二上学期开学考试数学试题
名校
2 . 如图所示,在正方体
中,
,分别是棱
上的点,若
,则
的大小是( )
![](https://img.xkw.com/dksih/QBM/2020/1/5/2370737661124608/2371494192578560/STEM/1d7efe7018de4d4a955c7f335257dddb.png?resizew=199)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84f23a20779cbf15d4300ffc69f27f14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6615468776f22d872598d36a0d904fbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a4e5c506307aeba8a6e26d8c98de521.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59d2e49b1a6162ac70c79cbe74802429.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/853a145d87413e60bc51004e0443420a.png)
![](https://img.xkw.com/dksih/QBM/2020/1/5/2370737661124608/2371494192578560/STEM/1d7efe7018de4d4a955c7f335257dddb.png?resizew=199)
A.等于90° | B.小于90° | C.大于90° | D.不确定 |
您最近一年使用:0次
2020-01-06更新
|
134次组卷
|
2卷引用:海南省文昌中学2019-2020学年高二上学期第二次月考数学试题
解题方法
3 . 如图,已知四棱锥
,底面
是
的菱形,又
平面
,且
,点
分别是棱
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/9/bc0f7611-1405-4833-9efc-ea6d85c17e6c.png?resizew=202)
(1)证明:
∥平面
;
(2)证明:平面
平面
;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cdf6426f0eaa95c31648895d35fe165.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1b49f64e0065edad868b25e9fcada3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37e2267c84394668eff2e9f5918de4fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6670479a0083dd2dfd5ad55b47b1ab6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c129fb303ad849a73ef59e5de105fd5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/9/bc0f7611-1405-4833-9efc-ea6d85c17e6c.png?resizew=202)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3533837e3d08c461dea031a44e5424d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b81fb655624ff75a5eab94de9b8c8e9.png)
(2)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6507d6b6ca4c46d3f05ba63f2718c3d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
您最近一年使用:0次
10-11高二下·江苏南通·期中
名校
解题方法
4 . 如图,四棱锥
的底面
为菱形,
平面
,
,
分别为
的中点,
.
![](https://img.xkw.com/dksih/QBM/2011/5/20/1570213308317696/1570213313781760/STEM/ec949fcbd6a34c6a8ff16a9345b40e6b.png?resizew=281)
(1)求证:
平面
.
(2)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f83a04565a8ebaa111894b724b0ba266.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433330447c4947540b3dc52719659681.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6166b9a5437671bcba31e17c375eb39.png)
![](https://img.xkw.com/dksih/QBM/2011/5/20/1570213308317696/1570213313781760/STEM/ec949fcbd6a34c6a8ff16a9345b40e6b.png?resizew=281)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f4c3f9dd5d0343597a7f58a1989b537.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d42008b36b1caa65dfd08a0cf5c4a35.png)
您最近一年使用:0次